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Re: When positive integer A is divided by positive integer B [#permalink]

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22 Dec 2009, 20:14

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prasadrg wrote:

Thank you for solving. I am still not clear the concept behind dividing 35/100 to get the reminder.

How do we assume 100 here?

I know it is subtle, and I am not able to catch it. Appreciate your help.

we know that A,B are +ve integers and when A is divided by B we get 4.35. This 4 is the quotient obtained when A is divided by B. We get 0.35 because A is not prefectly divisible by B and this 0.35 is the remainder which we need to find out in terms of whole numbers

0.35 = 35/100 (shifting the decimal 2 places to make it a whole number)this 35/100 is the remainder for A/B. On simplifying we get 7 as the remainder if B =20

Now we know quotient is 4 so if B = 20 A will be 4*20 + 7 = 87 (A/B gives 4.35)If B = 100 then A will be 4*100 + 35 = 435 (A/B gives 4.35)If B = 60 then A will be 4*60 + 21 = 261 (A/B gives 4.35)

so we can see that remainder in this case will be a multiple of 7. of the given option 14 satisfies this.hope this helps

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When positive integer A is divided by positive integer B, the result is 4.35. Which of the following could be the reminder when A is divided by B?

(A) 13 (B) 14 (C) 15 (D) 16 (E) 17

Notice that 0.35 = 35/100

So, we can write: A/B = 4 35/100 = 435/100So, one possible case is that A = 435 and B = 100When we divide 435 by 100, the remainder is 35Unfortunately 35 is NOT one of the answer choices.

Now let's examine some fractions that are EQUIVALENT to 435/100For example, 435/100 = 87/20 (= 4.35)In other words, A = 87 and B = 20In this case, when we divide A by B, the remainder is 7Unfortunately 7 is NOT one of the answer choices.

Find another fraction EQUIVALENT to 435/100How about 174/40 (= 4.35)In other words, A = 174 and B = 40In this case, when we divide A by B, the remainder is 14Aha, 14 IS one of the answer choices!!